<!DOCTYPE html>
<html lang="zh-CN">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>动态切换布局</title>
    <style>
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        body {
            font-family: Arial, sans-serif;
            background: linear-gradient(135deg, hsl(200, 60%, 85%), hsl(340, 70%, 85%));
            height: 100vh;
            overflow: hidden;
            display: flex;
            flex-direction: column;
        }

        /* 公共 Header 样式 */
        .header {
            height: 60px;
            background: rgba(255, 255, 255, 0.9);
            backdrop-filter: blur(10px);
            border-bottom: 1px solid rgba(0, 0, 0, 0.1);
            display: flex;
            align-items: center;
            padding: 0 20px;
            box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
            position: relative;
            z-index: 20;
            transition: all 0.5s ease;
        }

        .header .logo {
            font-size: 20px;
            font-weight: bold;
            color: #333;
        }

        .header .switch-button {
            background: #007bff;
            color: white;
            border: none;
            padding: 10px 20px;
            border-radius: 5px;
            cursor: pointer;
            transition: background 0.3s ease;
            margin-left: auto; /* 将按钮推到右侧 */
            z-index: 30;
        }

        .header .switch-button:hover {
            background: #0056b3;
        }

        /* 单页布局：Header 菜单 */
        .spa-header .menu {
            display: flex;
            gap: 20px;
            position: absolute;
            left: 50%;
            transform: translateX(-50%);
            top: 50%;
            translate: -50% -50%;
        }

        .spa-header .menu a {
            text-decoration: none;
            color: #333;
            font-weight: bold;
            padding: 10px;
            border-radius: 5px;
            transition: background 0.3s ease;
        }

        .spa-header .menu a:hover {
            background: rgba(0, 0, 0, 0.1);
        }

        /* 主容器 */
        .main-container {
            flex: 1;
            display: flex;
            overflow: hidden;
            transition: all 0.5s ease;
        }

        /* 经典布局：Sidebar */
        .sidebar {
            width: 250px;
            background: rgba(255, 255, 255, 0.9);
            backdrop-filter: blur(10px);
            border-right: 1px solid rgba(0, 0, 0, 0.1);
            padding: 20px;
            box-shadow: 2px 0 10px rgba(0, 0, 0, 0.1);
            transition: all 0.5s ease;
        }

        .sidebar ul {
            list-style: none;
        }

        .sidebar ul li {
            margin-bottom: 15px;
            cursor: pointer;
            padding: 10px;
            border-radius: 5px;
            transition: background 0.3s ease;
        }

        .sidebar ul li:hover {
            background: rgba(0, 0, 0, 0.1);
        }

        /* 内容区域 */
        .content {
            flex: 1;
            padding: 20px;
            overflow-y: auto;
            background: rgba(255, 255, 255, 0.8);
            backdrop-filter: blur(10px);
            transition: all 0.5s ease;
        }

        /* 动画控制 */
        .is-classic .sidebar {
            transform: translateX(0);
        }

        .is-classic .content {
            transform: translateX(0);
            width: calc(100% - 250px);
        }

        .is-spa .sidebar {
            transform: translateX(-100%);
            width: 0;
        }

        .is-spa .content {
            transform: translateX(-250px);
            width: 100%;
        }
    </style>
</head>
<body>
<!-- Header -->
<div class="header" id="header">
    <div class="logo">LOGO</div>
    <button class="switch-button" id="switchButton">切换到单页布局</button>
</div>

<!-- Main Container -->
<div class="main-container is-classic" id="mainContainer">
    <!-- Sidebar -->
    <div class="sidebar" id="sidebar">
        <ul>
            <li><a href="#">仪表盘</a></li>
            <li><a href="#">用户管理</a></li>
            <li><a href="#">设置</a></li>
            <li><a href="#">退出登录</a></li>
        </ul>
    </div>

    <!-- 内容区域 -->
    <div class="content">
        <h1>内容区域</h1>
        <p>这是内容区域。</p>
    </div>
</div>

<script>
    // 获取 DOM 元素
    const switchButton = document.getElementById('switchButton');
    const mainContainer = document.getElementById('mainContainer');
    const sidebar = document.getElementById('sidebar');
    const header = document.getElementById('header');

    let isClassic = true; // 初始为经典布局

    // 切换布局
    switchButton.addEventListener('click', () => {
        if (isClassic) {
            // 切换到单页布局
            mainContainer.classList.add('is-spa');
            mainContainer.classList.remove('is-classic');

            // 等待动画完成后再移动菜单到 Header
            setTimeout(() => {
                // 将 Sidebar 的菜单移动到 Header
                const menu = sidebar.querySelector('ul');
                menu.style.display = 'flex';
                menu.style.position = 'absolute';
                menu.style.left = '50%';
                menu.style.transform = 'translateX(-50%)';
                menu.style.top = '50%';
                menu.style.translate = '-50% -50%';
                header.appendChild(menu);
                header.classList.add('spa-header');
            }, 500); // 等待动画完成

            switchButton.textContent = '切换到经典布局';
        } else {
            // 切换到经典布局
            mainContainer.classList.add('is-classic');
            mainContainer.classList.remove('is-spa');

            // 等待动画完成后再将菜单移回 Sidebar
            setTimeout(() => {
                const menu = header.querySelector('ul');
                menu.style.display = '';
                menu.style.position = '';
                menu.style.left = '';
                menu.style.transform = '';
                menu.style.top = '';
                menu.style.translate = '';
                sidebar.appendChild(menu);
                header.classList.remove('spa-header');
            }, 500); // 等待动画完成

            switchButton.textContent = '切换到单页布局';
        }
        isClassic = !isClassic; // 切换状态
    });
</script>
</body>
</html>
